RM8 Software-Defined VHF UHF High Speed Data Modem
Offering a wide range of standards-based waveforms and protocols, the RM8
software defined modem with ALE, offers interoperable data modem and
link setup in a standalone unit for strategic and maritime data communications.
Whether point-to-point or point-to-multipoint, the RM8 can be operated as a
VHF or UHF software-defined modem, which is activated by the user with a
key selection.
Intended for operation with VHF or UHF radios with an audio bandwidth exceeding 21 kHz, the RM8 transfers data at rates of up to
96,000 bps over a standard 25 kHz VHF or UHF radio channel.
Low data rates (up to 32 kbps) use Offset QPSK and 8- PSK waveforms and are suitable for radios with a non-linear power amplifier (PA).
The very high rates use QAM and require a linear PA or can work with wideband FM or AM radios.
Adaptive equalization mitigates the effects of VHF or UHF channel multi-path. Convolutional encoding combined with soft-decision
Viterbi decoding provides forward error correction. High performance Doppler tacking allows operation at up to 250 km/h relative
speed (at 80 MHz).
Key Features
- VHF/UHF modem operation
- 96000 bps in 24 kHz channel
- 48000 bps in 12 kHz channel
- Adaptable configuration
- Bandwidths: 24, 12, 9, 6 & 3 kHz
- Menu-Driven control & configuration
- Synchronous/Asynchronous DTE port
- Ethernet LAN interface for Control
- AC and DC Power
- Compatible with RC66/ARQ
- License keys unlock software
Additional Features
- High Data Rate Modems
- Up to 96000 bps (128-QAM)
- Up to 76800 bps (64-QAM)
- Up to 48000 bps (16-QAM)
- Low Data Rate Modems
- Up to 32000 bps (8-PSK)
- Up to 16000 bps (QPSK)
- Adaptive Equalization
External Interfaces
The RM8 unit is fully controllable via the front panel as well as by the serial remote or Ethernet control interface and provides a DTE port
for synchronous and asynchronous data.
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| RM8 based Synchronous V/UHF Data System |
Specifications
| BANDWIDTH | DATA RATES [BPS] | V1 |
| 24 kHz | High Rate: 96000, 76800, 64000, 48000 (Coded) Low Rate: 32000, 16000, 9600, 4800, 2400 (Coded) | ● |
| 12 kHz | High Rate: 48000, 38400, 32000, 24000 (Coded) Low Rate: 16000, 8000, 4800, 2400, 1200 (Coded) | ● |
| 9 kHz | High Rate: 36000, 28800, 24000, 18000 (Coded) Low Rate: 12000, 6000, 3600, 1800, 900 (Coded) | ● |
| 6 kHz | High Rate: 24000, 19200, 16000, 12000 (Coded) Low Rate: 8000, 4000, 2400, 1200, 600 (Coded) | ● |
| 3 kHz | High Rate: 12000, 9600, 8000, 6000 (Coded) Low Rate: 4000, 2000, 1200, 600, 300 (Coded) | ● |
| GENERAL | ||
| Environmental Specifications |
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| Size |
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| Installation | Compact design: The unit occupies a width less than ½ of am 1U 19” rack slot. | |
| Presets | Factory and Custom Presets | |
| INTERFACES | |
| DTE (Data) Port (DB25F) | RS-422 balanced, RS-423, RS-232 unbalanced., MIL-STD-188-114 (interoperable), EIA 530A compliant Half & Full Duplex operation, Synchronous, Standard and High-speed Async modes |
| Remote Control/ GPS Port (DE9M) | Remote Control Pins: RS-485 Multi-drop, RS-422 balanced or RS-232 Protocol: Control Protocol (RAP1 + RIPC, ASCII S5066 Annex E) |
| External GPS Control Pins: RS-232 (nominally input) Data Rate: 300 to 19200 bps, 1/2 stop bits, 7/8 bit data. PPS line: RS 232/422 (NMEA) or TTL | |
| GPS Antenna (MCX) | Built-in GPS receiver: Time reference for 2G ALE Linking protection (AL-2). |
| Ethernet CTRL Port (RJ45) | Remote Control: 10/100 Base T (IEEE 802.3U compatible), embedded TCP/IP Stack Protocol: Control Protocol (RAP1 + RIPC) |
| Ethernet Data Port (RJ45) | IP Packet Data: 10/100 Base T (IEEE 802.3U compatible), embedded TCP/IP Stack Protocol: Raw IP packet data. |
| Local Control | Local control via 32x202 pixel graphical LCD display and 16-key keypad. 3 bi-colour LED indicators Alphanumeric and digit keypad for fast data entry, 4-way navigation button |
| Radio Control & Audio Ports (DB25M) | Radio Control Pins (2 channels): RS-232, up to 115200 bps, 1/2 stop bits, 7/8 bit data Supports for various radio control protocols are built-in. |
| Input Audio (2 channels): 600 Ohm balanced, –20 to +10 dBm without adjustment Output Audio (2 channels): Balanced, –40 to +10 dBm adjustable into 600 ohm load Keyline: Non-polarized contact closure (<45 V, 200 mA). PTT Sense Input: Pull to ground to indicate external PTT. | |
| Aux Audio Pins: Connection of microphone for ALE voice calling Input Audio: 600 ohm balanced, –20 to +10 dBm without adjustment or MIC input (selectable) Output Audio: Balanced, –40 to +10 dBm adjustable into 600 ohm load | |